In the end you can bitch about it as much as you like, but seeing the assault on the Necromancer is something Tolkien fans ABSOLUTELY want to behold on a movie screen, so you can just shut up about it.

This is our movie, not yours. Now **** off.

Amen. Peter Jackson is a Tolkien fan, and he is making movies for Tolkien fans. You can't please everyone, but Jackson has done an incredible job pleasing the fanbase as a whole.